The percent changes in L-values for the apple juice with or without the treatments of 0.1 mM of phytic acid are shown in Fig. 2. Although the L-values for the apple juice treated with
0.1 mM phytic acid increased with storage time, they were significantly lower than those of the control (p< 0.05): after 6 h L in the treated juice was only 27.7% of that of the control. The reduced browning of phytic-acid-treated apple juice was coincidental with its PPO inhibitory activity (Fig. 1)